const { quora, quoraResult } = require('#api');
const { paginator } = require('#client');

const { createEmbed, formatPaginationEmbeds, page } = require('#utils/embed')
const { link, pill } = require('#utils/markdown')
const { editOrReply } = require('#utils/message')
const { STATICS } = require('#utils/statics')

// TODO: Turn this into a general purpose permissions constant
const { Permissions, InteractionCallbackTypes } = require("detritus-client/lib/constants");
const { Components } = require('detritus-client/lib/utils');

function createQuoraAnswerPage(context, question, answer) {
  let tags = question.tags.map((t) => {
    return pill(t)
  })
  let res = page(
    createEmbed("default", context, {
      title: question.title,
      url: answer.url,
      description: `${tags.splice(0, 3).join('  ')}\n\n${answer.content.substr(0, 2000)}`,
      footer: {
        iconUrl: STATICS.quora,
        text: `Quora • ${context.application.name}`
      }
    }))

  if (answer.content.length >= 2000) {
    if (res.embeds[0].description.endsWith(' ')) res.embeds[0].description = res.embeds[0].description.substr(0, res.embeds[0].description.length - 1)
    res.embeds[0].description += link(answer.url, '...', 'Click to read the entire answer.')
  }

  if (answer.author) {
    res.embeds[0].author = {
      name: answer.author.name.substr(0, 1000),
      iconUrl: answer.author.icon,
      url: answer.author.url
    }
  }
  return res;
}

async function quoraPaginator(context, pages, refMappings, currentRef) {
  const paging = await paginator.createPaginator({
    context,
    pages,
    buttons: [
      "previous",
      "next",
      "search"
    ]
  });

  paging.on("interaction", async ({ context: ctx, listener }) => {
    if (ctx.customId == "search") {
      // Kill the original paginator and replace it with a select
      listener.stopWithoutUpdate()

      const components = new Components({
        timeout: 100000,
        run: async (sctx) => {
          if (sctx.userId !== context.userId) {
            return await sctx.respond(InteractionCallbackTypes.DEFERRED_UPDATE_MESSAGE);
          }
          await sctx.editOrRespond({
            embeds: [
              createEmbed("loading", context, "Loading quora result...")
            ],
            components: []
          })
          // Get the page reference and fetch the results
          let ref = refMappings.filter((r) => r.ref == sctx.data.values[0])
          ref = ref[0]
          try {
            let search = await quoraResult(context, ref.link)
            search = search.response.body

            if (search.status == 2) return editOrReply(context, createEmbed("error", context, search.message))

            let nextPages = []
            // Create the initial page

            for (const answer of search.answers) {
              nextPages.push(createQuoraAnswerPage(context, search.question, answer))
            }

            nextPages = formatPaginationEmbeds(nextPages)

            await quoraPaginator(context, nextPages, refMappings, sctx.data.values[0])

          } catch (e) {
            console.log(e)
            return editOrReply(context, createEmbed("error", context, `Unable to perform quora search.`))
          }
        },
      });

      let selectOptions = refMappings.map((r) => {
        return {
          label: r.title,
          value: r.ref,
          default: (r.ref == currentRef)
        }
      })

      components.addSelectMenu({
        defaultValues: [],
        placeholder: "Select a question.",
        customId: "quora-select",
        options: selectOptions
      })

      await ctx.editOrRespond({ content: `<@${context.userId}> Select a question.`, components })
    }
  })
}

module.exports = {
  name: 'quora',
  label: 'query',
  aliases: ['q'],
  metadata: {
    description: 'Searches for questions on Quora.',
    description_short: 'Search on Quora',
    examples: ['quora How does Quora work?'],
    category: 'search',
    usage: 'quora <query>'
  },
  permissionsClient: [Permissions.EMBED_LINKS, Permissions.SEND_MESSAGES, Permissions.USE_EXTERNAL_EMOJIS, Permissions.READ_MESSAGE_HISTORY],
  run: async (context, args) => {
    context.triggerTyping();
    if (!args.query) return editOrReply(context, createEmbed("warning", context, `Missing Parameter (query).`))
    try {
      let search = await quora(context, args.query)
      search = search.response.body

      if (search.status == 2) return editOrReply(context, createEmbed("error", context, search.message))

      let pages = []

      // Create the initial page
      for (const answer of search.answers) {
        pages.push(createQuoraAnswerPage(context, search.question, answer))
      }

      pages = formatPaginationEmbeds(pages)

      const refMappings = search.results

      await quoraPaginator(context, pages, refMappings, refMappings[0].ref)

    } catch (e) {
      console.log(e)
      return editOrReply(context, createEmbed("error", context, `Unable to perform quora search.`))
    }
  },
};